JPH07115626A - Decoder for television signal - Google Patents

Abstract

PURPOSE:To improve picture quality in a moving area at low cost concerning the device for sub sampling a television signal, transmitting the signal and decoding it at the time of decode while dividing it into a still area and the moving area. CONSTITUTION:A still area processing part 10 reproduces the information of the still area in an image based on the television signal from the information of plural fields while using field memories F1-F4. At a moving area processing part 200, in-field interpolation is performed concerning the present signal of the television signal, in-field interpolation is performed concerning delayed signals from the field memories F1-F2 of the still area processing part 10 and further, inter-field interpolation is performed by using these signals to which the in-field interpolation is performed so that the information in the moving area of the signal based on the television signal can be reproduced. The area, where the image based on the television signal is moved, is detected by a moving area detecting means 3. The output of the still picture processing part 10 and the output of the moving area processing part 200 are synthesized corresponding to a motion detected amount from the moving area detecting means 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, for example, a multiple sub-Nyquist sampling system (so-called MUSE system) is used to remove a pixel signal for one field from each other and band-compresses a television signal into a still area ( The present invention relates to a decoding device that performs different processing for a still area of an image) and a moving area (a moving area of the image).

[0002]

2. Description of the Related Art A high-definition system has been developed as one of the television systems of higher quality than the NTSC system and the PAL system, but the standard is a field frequency fV = 60 Hz, a frame frequency fFR = fV / 2 horizontal. The frequency fH = 1125 × fFR = 33.75 kHz and the aspect ratio = 9: 16.

Therefore, the video signal according to the high-definition system has an information amount about 5 times as large as that of the video signal according to the NTSC system (the red, green, and blue signal bands are 30 MHz each), and the video signal according to the high-definition system is transmitted to a broadcasting satellite. , It cannot be transmitted as it is with a video disc.

Therefore, the video signal of the high-definition system is band-compressed by the so-called MUSE system so that the base band width becomes about 8 MHz and then transmitted. The MUSE method is a method of reducing the amount of image information to be transmitted by utilizing human visual characteristics.

That is, the visual characteristics of humans are characterized in that the resolution is lower for a moving object whose resolution in the diagonal direction is lower than that in the horizontal and vertical directions on the screen. In the MUSE method, the original high-definition signal is converted into a digital signal based on the characteristic of, and then sampling points are thinned out by a sampling method suitable for, and then converted into an analog signal for transmission. Also, from the characteristics of, the processing is changed between the moving area and the still area of the image,
By reducing the resolution of the moving area, the amount of information to be transmitted is reduced.

The MUSE system is basically dot interlaced transmission, and the sampling pattern is repeated in four field cycles with inter-frame, inter-field and inter-line offsets.

In the MUSE system, the video signal (luminance signal and color signal) and the quasi-instantaneous companding DPCM are used.
Audio data encoded by the method and an independent additional information signal are multiplexed on the time axis. However, MU
Even in the high definition video signal band-compressed by the SE system, the frame frequency and the horizontal frequency are
It is equal to the frame frequency fFR and horizontal frequency fH of the original high definition video signal.

In the following description, for simplification, the high-definition video signal band-compressed by the MUSE system is referred to as "MUSE video signal". As described above, in addition to broadcasting satellites, video discs and video tapes are considered as transmission media for the high-definition television system video signals.

By the way, the decoder of the MUSE type video signal is conventionally constructed as shown in FIG. In FIG. 4, the decoding process of the luminance signal will be described.
The chroma signal can be decoded in almost the same manner.

For example, a MUSE type video signal from the BS tuner is supplied to the input processing circuit 12 through the input terminal 1. In this input processing circuit 2, the input signal is band-limited by a low-pass filter and then converted into a digital signal by an A / D converter. The sampling frequency at this time is 16.2 MHz.

The input processing circuit 2 also detects horizontal and vertical synchronizing signals, generates a clock in synchronization with the horizontal synchronizing signals, and supplies them to each digital signal processing circuit described later. Furthermore, MUS
The digital signal of the E-system video signal is de-emphasized by the input processing circuit 2 and subjected to the inverse Γ characteristic for transmission, and then supplied to the stationary area processing circuit 10 and the moving area processing circuit 20.

In the stationary area processing circuit 10, first, the interframe interpolation circuit 11 performs interframe interpolation processing by using the current signal, the signal delayed by one frame and the signal delayed by two frames. Then, the data in the stationary region having the sampling frequency of 32.4 MHz is reproduced.
For this inter-frame interpolation, the inter-frame interpolation circuit 11 is provided with four field memories F1 to F4, and signals from the field memories F2 and F4 are used to perform inter-frame interpolation processing. .

The luminance signal from the inter-frame interpolating circuit 11 is supplied to the sampling rate converting circuit 12 and the 3
The sampling frequency is converted from 2.4 MHz to 48.6 MHz.

In the static region processing circuit 10, the signal whose sampling rate has been further converted is supplied to the inter-field interpolation circuit 13 and inter-field interpolated. As a result, the video signal in the still region is restored from the signal of 4 fields.

On the other hand, in the motion area processing circuit 20, the intra-field interpolating circuit 21 interpolates only from the data in one field, and the sampling frequency is 3
It is set to 2.4 MHz. This field interpolation circuit 21
Is supplied to the sampling rate conversion circuit 22, and the sampling frequency is converted from 32.4 MHz to 48.6 MHz.

The signal from the still area processing circuit 10 and the signal from the motion area processing circuit are mixed at a ratio according to the motion detection signal MD, as described later. Motion detection signal M
D is detected by the motion area detection circuit 3.

Motion detection can usually be performed by taking a difference between frames. However, in the MUSE method, the still area is encoded by performing offset sampling between frames so that one frame is composed of two frames. Therefore, in the signal one frame before,
It is necessary to detect the motion region by using signals that are not at the same sampling point but two frames apart. In addition, since motion cannot be detected in a special image depending on the difference between the current frame and the frame two frames before, motion detection is performed using data of four frames.

Therefore, the current signal and the data of one frame and two frames before from the field memories F2 and F4 are supplied to the motion area detection circuit 3. The amount of movement is
It is detected from the absolute value of the difference in pixel data between two frames. Motion detection output MD from the motion area detection circuit 3
Takes a value between "0" and "1" as shown in FIG. 5 when the horizontal axis represents the frequency of the motion of the image (called temporal frequency).

As described above, in the MUSE method, the still area is encoded so that one frame is composed of two frames. Therefore, from the Nyquist sampling theorem, an image of the still area can be reproduced without distortion. , Temporal frequency of image movement (called temporal frequency)
Is up to 7.5 Hz (1/4 of the frame frequency), and the motion detection signal MD has a temporal frequency of 7.5H.
The part equal to or less than z is detected as "0", that is, a stationary area. Then, the portion where the temporal frequency is 7.5 Hz or higher is detected as motion, and the temporal frequency is 7.5 Hz.
When it exceeds, the motion detection signal MD sharply changes to "1". It should be noted that a region having a predetermined width (for example, 3 Hz) from 7.5 Hz where “0” changes to “1” is 0 <MD <1.

The output signal of the stationary area processing circuit 10 is multiplied by the coefficient Ks = 1-MD in the coefficient multiplication circuit 4,
Further, the output signal of the motion area processing circuit 20 is multiplied by the coefficient Km = MD in the coefficient multiplication circuit 5. And
The outputs of these multiplication circuits 4 and 5 are supplied to the mixing circuit 6.

Therefore, when MD = 0 and the temporal frequency is 7.5 Hz or less in the image region, the output signal from the static region processing circuit 10 is taken out from the mixing circuit 6. Further, in the region where 0 <MD <1, the signal from the stationary region processing circuit 10 and the signal from the motion region processing circuit 20 are mixed by being weighted by the motion detection signal MD from the mixing circuit 6. Taken out. Furthermore, MD = 1
In the region of the temporal frequency which is, the signal from the motion area processing circuit 20 is extracted from the mixing circuit 6. Although not shown, the output signal of the mixing circuit 6 is D / A converted and returned to an analog signal.

[0022]

By the way, as described above, in the conventional MUSE decoder, in the motion area processing, the image is reproduced by performing only the intra-field interpolation, so that the resolution is deteriorated as compared with the still area.

Then, as shown in FIG.
In the SE decoder, the region where the temporal frequency exceeds 7.5 Hz is all processed as the motion region, so that the relatively slowly moving image portion is also processed as the motion region, and such a motion region is blurred. There is an inconvenience.

In order to improve this problem, a method has been proposed in which the encoder side introduces inter-field processing for the motion region to improve the image quality of the motion region (IEICE Transactions BI Vol.J75). -BI No.1
0 P639 to P646 October 1992), but this method has a problem that the system of the broadcasting station itself is changed.

Therefore, the present applicant has previously proposed a method of improving the image quality of a relatively slow moving area by changing only the decoder side without changing the encoder side ( Japanese Patent Application No. 5-121686,
Application on May 24, 1993).

FIG. 7 is a block diagram of an embodiment of the previously proposed decoding device. In this example, the stationary area processing circuit 1
0 is completely the same as the conventional example of FIG. 4, but is different in that the motion area processing circuit is the circuit 20A and the inter-field processing function is added.

That is, in this example, the sampling frequency from the intra-field interpolation circuit 21 is 32.4.
The signal of MHz is supplied to the mixing circuit 27 and the subtraction circuit 23. On the other hand, the input processing circuit 2
The sample interpolation circuit 24 inserts a pixel sample of, for example, "0" for each pixel to set the sampling frequency to 32.4 MHz, and then the subtraction circuit 2
3 and the output signal of the intra-field interpolation circuit 21 is subtracted from this.

FIG. 6 shows how the pixel interpolation circuit 24 interpolates the pixel samples. That is, FIG. 6A shows a sample sequence of signals from the input processing circuit 2, and FIG. 6B shows a sample sequence in which pixel samples of data “0” are interpolated.

Here, the spatial frequency characteristic of the intra-field interpolation circuit 21 is as shown in FIG. 8, and from the signal from the input processing circuit 2 from the subtraction circuit 23,
Lost due to band limitation by the intra-field interpolation circuit 21,
Components in the spatial frequency band as shown in FIG. 9 are obtained.

The output signal of the subtraction circuit 23 is 12 MH.
The band is limited by the low-pass filter 25 of z. This is because the inter-field interpolation cannot reproduce a still region of 12 MHz or more.

The output of the low-pass filter 25 is supplied to the inter-field interpolation circuit 26 for inter-field interpolation. The inter-field interpolation circuit 26 performs an interpolation process using a signal extending over three fields,
The signal for one frame is restored. The spatial frequency characteristic of the inter-field interpolation circuit 26 is shown in FIG. Therefore, from the inter-field interpolation circuit 26, a signal showing the spatial frequency band as shown in FIG. 11 is obtained.

The output of the inter-field interpolation circuit 26 is supplied to the mixing circuit 27 and mixed with the output signal of the intra-field interpolation circuit 21. The output signal of the mixing circuit 27 has a low temporal frequency (for example, 7.5).
(Hz to 15 Hz) has the same spatial frequency band as the stationary region, and the higher part has a signal with the same spatial frequency band as the conventional motion.

Temporal frequency of 7.5 Hz to 15 Hz
Region processing circuit 10 for signals in the middle motion region of
When the processing is performed by (4), image quality deterioration such as image shift (double or triple) occurs due to interpolation processing using signals of four fields. Further, when only the intra-field interpolation of the motion area processing circuit 20 is applied to the signal of the intermediate motion area, the resolution of the reproduced image is limited to the spatial frequency band of FIG. 8 as described above. So-called blur is a problem.

On the other hand, when the inter-field interpolation circuit 26 is added to the motion area processing circuit 20 as in the example of FIG. 7, the image quality is somewhat deteriorated due to the aliasing distortion, but the temporal frequency is 7 It is possible to obtain a reproduced image with little blurring with respect to a signal in an intermediate moving region of 0.5 Hz to 15 Hz and without image shift.

However, in the case of the example of FIG. 7, it is necessary to newly add a memory for two fields for the inter-field interpolating circuit 26, resulting in high cost and
There is a problem that the decoding device becomes large.

FIG. 12 shows a specific configuration example of the inter-field interpolation circuit 26. In this example, information for four lines is created by using vertical correlation of signals over three fields.
An interpolated output signal for one pixel is obtained as a mixed signal of information created by the FIR digital filter using a plurality of pixels on each line.

In FIG. 12, 31 to 38 are delay circuits for one line (1H means one line in the figure). Also, 41 and 42 are delay circuits for 560 lines. 51 to 54 and 55 to 57 are adder circuits, 61 to 6
Reference numeral 4 is a 1/2 coefficient multiplication circuit.

Further, 71 to 74 are FIR type digital filters, and D is a delay circuit for one pixel. In this example, each of the FIR digital filters 71 to 74 creates data for one pixel from data for eight pixels. Weighting coefficient C of each FIR digital filter 71-74
By selecting the values of 00 to C04, C10 to C14, C20 to C24, and C30 to C34, the interfield interpolation circuit 26 is set to have the desired frequency characteristic.

In FIG. 12, the output Sf1 of the delay circuit 41 is a signal obtained by delaying the output of the low pass filter 25 by 1 field, and the output Sf2 of the delay circuit 42 is a signal obtained by delaying the output of the low pass filter 25 by 1 field. Is. That is, the inter-field interpolation circuit 26 substantially includes a memory for two fields, which is equivalent to the addition of two field memories F5 and F6 as shown in FIG.

An interframe interpolation circuit may be used in the motion area processing circuit instead of the interfield interpolation circuit, but in that case, two frame memories (two field memories) are required instead of the field memories. Become.

According to the present invention, as in the above-mentioned video signal decoding apparatus of the MUSE system, the still area and the moving area are processed separately, and the interpolation processing using the signals of a plurality of fields is also used for the processing of the moving area. The purpose of this is to implement the above without adding a field (or frame) memory.

[0042]

In order to solve the above-mentioned problems, the apparatus according to the present invention also uses a plurality of field memories of the static area processing circuit also in the inter-field (frame) interpolating circuit of the motion area processing circuit. When the reference symbols of the embodiments described later are made to correspond to each other, it is a decoding device of a television signal in which pixel samples per one field (or one frame) are thinned out by sub-sampling and band-compressed. Still frame processing unit 1 for reproducing the information of the still area of the image by the television signal from the information of a plurality of fields (or frames) using frame memories F1 to F4.
0 and intra-field (or frame) interpolation is performed on the current signal of the television signal, and inter-field (or frame) interpolation is performed on the delayed signal from the field (or frame) memory of the stationary area processing unit. In addition, the inter-field (or frame) interpolation is performed by using these inter-field (or frame) interpolated signals to reproduce the information on the motion area of the image by the television signal, and A moving area detecting means 3 for detecting a moving area of an image by the television signal,
It is characterized in that the output of the stationary area processing unit 10 and the output of the moving area processing unit 200 are combined according to the amount of motion detection from the motion detecting means.

[0043]

In the present invention having the above-described structure, for example, in the case of processing on a field-by-field basis, the motion area processing circuit interpolates the television signal of the current field within the field and the field of the still area processing circuit. The output of the memory is also inter-field interpolated to generate signals for the number of fields required for inter-field interpolation. Then, inter-field interpolation is performed using the inter-field interpolation results of these plural fields.

[0044]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a television signal decoding apparatus according to the present invention will be described below with reference to FIGS. 1 to 3 by taking the case of the MUSE decoding apparatus described above as an example.

In this example, the static area processing circuit 10
The configuration of is the same as the conventional one. The motion area processing circuit 200 in the case of this example has the configuration of FIG. 2 described later, and the signals of a plurality of fields used in the processing of inter-field interpolation are input to this circuit 200. That is,
In the case of this example, the signal So of the current field from the input processing circuit 2 and the signal S1 one field before from the field memory F1 used for the static area processing (corresponding to the signal Sf1 of the example of FIG. 7) are used. , A signal S2 two fields before (corresponding to the signal Sf2 in the example of FIG. 7) from the field memory F2 are input.

Then, as shown in FIG. 2, in the motion region processing circuit 200, these input signals So, S1,
For S2, the motion signal processing circuits for the intra-field interpolation processing and the subtraction processing in the circuit of FIG. 7 are provided. This is because the input signals So and S of each field are
This is because the inter-field interpolation processing for the motion area, which will be described later, can be performed using steps 1 and S2.

That is, the respective signals So, S1, S2 are supplied to the intra-field interpolating circuits 210, 211, 212, respectively, and are interpolated by the signals in the respective fields, so that the sampling frequency is from 16.2 MHz. Three
It is set to 2.4 MHz. Then, the outputs of these intra-field interpolation circuits 210, 211, 212 are output to the subtraction circuit 23.
0, 231, 232 are supplied.

The signals So, S1 and S2 are set to 1 by the sample interpolation circuits 240, 241, and 242, respectively.
For example, a pixel sample of “0” is inserted for each pixel,
After the sampling frequency is set to 32.4 MHz, it is supplied to the subtraction circuits 230, 231, and 232, and the intra-field interpolation circuits 210, 211, and 2 are supplied from these signals, respectively.
The 12 output signals are subtracted.

That is, the subtraction circuits 230, 231, 23
From 2 onward, as described in the example of FIG. 7 described above, of the respective input signals So, S1, S2, the space lost due to band limitation by the intra-field interpolation circuit 21 as shown in FIG. A frequency band component is obtained.

The output signals of these subtraction circuits 230, 231, 232 are low-pass filters 2 of 12 MHz, respectively.
The band is limited by 50, 251, and 252, and the inter-field interpolation circuit 260 is supplied. The inter-field interpolation circuit 260 uses the low-pass filters 250 and 25.
A signal for one frame is restored by performing an interpolation process using a signal from 1, 252 over three fields.

Then, the output of the inter-field interpolation circuit 26 is supplied to the mixing circuit 27 and mixed with the output signal of the intra-field interpolation circuit 211. As described above, the output signal of the mixing circuit 27 has the same spatial frequency band as the stationary region in the low temporal frequency part (for example, 7.5 Hz to 15 Hz), and the high spatial frequency band in the same spatial frequency band as the conventional motion. It has become a signal. Therefore, it is possible to obtain a reproduced image with little blurring with respect to a signal in an intermediate motion region having a temporal frequency of 7.5 Hz to 15 Hz, and with no image shift.

The output of the intra-field interpolating circuit 211 is used as a signal mixed with the inter-field interpolating circuit 260 in the center of the three fields. It was because I did).

In the case of this example, the inter-field interpolation circuit 26
0 does not need to incorporate a field memory like the example of FIG. 12, and is configured as shown in FIG. In FIG. 3, the same parts as those of the inter-field interpolation circuit 26 of FIG. 12 are designated by the same reference numerals.

As is apparent from the comparison between FIG. 3 and FIG. 12, the interpolator 260 of FIG. 3 includes the delay circuit 4 for 560H (1H is 1 horizontal line) corresponding to the field memory.
1, 42 do not exist.

That is, in this example, by using the output signals of the field memories F1 and F2 of the stationary area processing circuit 10, the moving area processing circuit 20A of FIG.
The required field memories F5 and F6 (delay circuits 41 and 42 in FIG. 12) are not required, the configuration can be simplified, and the cost is reduced.

Although the above example has been described as a block diagram for the luminance signal, the processing of the chroma signal can be similarly performed.

In the motion area processing circuit 200,
The inter-field interpolation processing is performed using the signal of 3 fields, but the signal of 2 fields may be used.

Further, the circuit 26 of the motion area processing circuit 200
0 may be an inter-frame processing circuit instead of the inter-field processing circuit, and may be a circuit that uses both inter-field processing and inter-frame processing in combination.

Further, although the present invention has been described as applied to the MUSE decoder, the present invention thins out pixel data by sub-sampling and transmits the data, and at the time of decoding, still region processing and motion region processing are separately performed. The present invention can be applied to all television signal decoding devices.

[0060]

As described above, according to the present invention, a television for improving the image quality of a moving area by performing processing using signals of a plurality of fields or a plurality of frames also in a moving area processing circuit. In the signal decoding device, since the field or frame signal necessary for processing using a signal of a plurality of fields or a plurality of frames is obtained from the field memory or the frame memory used in the still region processing,
The field memory or the frame memory can also be used as the memory for the static region processing and the motion region processing, so that the decoding device can be manufactured at low cost and the configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a television signal decoding apparatus according to the present invention.

FIG. 2 is a block diagram of an embodiment of a main part of the example of FIG.

3 is a block diagram of an embodiment of the partial circuit of FIG.

FIG. 4 is a block diagram of an embodiment of a conventional television signal decoding apparatus.

FIG. 5 is a diagram showing a characteristic of a motion area detection output.

FIG. 6 is a diagram for explaining sample interpolation.

FIG. 7 is a block diagram of an embodiment of a previously proposed television signal decoding apparatus.

FIG. 8 is a diagram showing a spatial frequency characteristic for explaining the example of FIG. 7.

9 is a diagram showing a spatial frequency characteristic for explaining the example of FIG. 7. FIG.

FIG. 10 is a diagram showing a spatial frequency characteristic for explaining the example of FIG. 7.

FIG. 11 is a diagram showing a spatial frequency characteristic for explaining the example of FIG. 7.

12 is a block diagram of an embodiment of a main part of the example of FIG. 7. FIG.

[Explanation of symbols]

 2 Input processing circuit 3 Motion area detection circuit 4, 5 Coefficient multiplication circuit 6 Mixing circuit 10 Still area processing circuit 200 Motion area processing circuit 210-212 In-field interpolation circuit 230-232 Subtraction circuit 260 Inter-field interpolation circuit 27 Mixing circuit So current Field signal S1 1 field before signal S2 2 field before signal

[Procedure amendment]

[Submission date] April 26, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

In the stationary area processing circuit 10, first, the interframe interpolation circuit 11 performs interframe interpolation processing by using the current signal, the signal delayed by one frame and the signal delayed by two frames. Then, the data in the stationary region having the sampling frequency of 32.4 MHz is reproduced.
For this inter-frame interpolation and noise reduction processing ,
The inter-frame interpolation circuit 11 is provided with four field memories F1 to F4, and signals from the field memories F2 and F4 are used to perform inter-frame interpolation processing.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014] In a still region processing circuit 10, further, the signal sampling rate is converted is supplied to the inter-field interpolation circuit 1 4 is inserted in between fields. As a result, the video signal in the still region is restored from the signal of 4 fields.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

The output of the low-pass filter 25 is supplied to the inter-field interpolation circuit 26 for inter-field interpolation. The inter-field interpolation circuit 26 performs an interpolation process using a signal extending over three fields,
The signal for one field is restored. The spatial frequency characteristic of the inter-field interpolation circuit 26 is shown in FIG. Therefore, from the inter-field interpolation circuit 26, a signal showing the spatial frequency band as shown in FIG. 11 is obtained.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

Further, 71 to 74 are FIR type digital filters, and D is a delay circuit for one pixel. In this example, each of the FIR digital filters 71 to 74 creates data for one pixel from data for nine pixels. Weighting coefficient C of each FIR digital filter 71-74
By selecting the values of 00 to C04, C10 to C14, C20 to C24, and C30 to C34, the interfield interpolation circuit 26 is set to have the desired frequency characteristic.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

In this example, the static area processing circuit 10
The configuration of is the same as the conventional one. The motion area processing circuit 200 in the case of this example has the configuration of FIG. 2 described later, and the signals of a plurality of fields used in the processing of inter-field interpolation are input to this circuit 200. That is,
In the case of this example, the signal S 0 of the current field from the input processing circuit 2 and the signal S1 one field before from the field memory F1 used for the static region processing (corresponding to the signal Sf1 of the example of FIG. 7). And a signal S2 two fields before from the field memory F2 (corresponding to the signal Sf2 in the example of FIG. 7) are input.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

Then, as shown in FIG. 2, in the motion area processing circuit 200, these input signals S 0 , S 1,
For S2, the motion signal processing circuits for the intra-field interpolation processing and the subtraction processing in the circuit of FIG. 7 are provided. This is because the input signals S 0 , S of each field are
This is because the inter-field interpolation processing for the motion area, which will be described later, can be performed using steps 1 and S2.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction content]

That is, the respective signals S 0 , S 1 , S 2 are supplied to the intra-field interpolating circuits 210, 211, 212, respectively, and are interpolated by the signals in the respective fields, so that the sampling frequency is 16.2 MHz. From 3
It is set to 2.4 MHz. Then, the outputs of these intra-field interpolation circuits 210, 211, 212 are output to the subtraction circuit 23.
0, 231, 232 are supplied.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

Further, each of the signals S 0 , S 1 , S 2 is set to 1 by the sample interpolation circuits 240, 241, 242, respectively.
For example, a pixel sample of “0” is inserted for each pixel,
After the sampling frequency is set to 32.4 MHz, it is supplied to the subtraction circuits 230, 231, and 232, and the intra-field interpolation circuits 210, 211, and 2 are supplied from these signals, respectively.
The 12 output signals are subtracted.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0049

[Correction method] Change

[Correction content]

That is, the subtraction circuits 230, 231, 23
From 2 onward, as described in the example of FIG. 7 described above, among the respective input signals S 0 , S 1 , S 2, the band is limited by the intra-field interpolation circuit 21 and lost, as shown in FIG. 9. The components of the spatial frequency band are obtained.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0050

[Correction method] Change

[Correction content]

The output signals of these subtraction circuits 230, 231, 232 are low-pass filters 2 of 12 MHz, respectively.
The band is limited by 50, 251, and 252, and the inter-field interpolation circuit 260 is supplied. The inter-field interpolation circuit 260 uses the low-pass filters 250 and 25.
Interpolation processing is performed using signals from 1 and 252 over three fields to restore a signal for one field .

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0051

[Correction method] Change

[Correction content]

[0051] and, between the field interpolation circuit 26 0
Is supplied to the mixing circuit 27 and mixed with the output signal of the intra-field interpolation circuit 211. As previously mentioned,
The output signal of the mixing circuit 27 has the same spatial frequency band as the stationary region in the low temporal frequency portion (for example, 7.5 Hz to 15 Hz), and the high spatial frequency band in the high portion. There is. For this reason,
It is possible to obtain a reproduced image with little blurring with respect to the signal in the intermediate motion region having a temporal frequency of 7.5 Hz to 15 Hz, and with no image shift.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Description of Reference Signs] 2 input processing circuit 3 motion area detection circuit 4, 5 coefficient multiplication circuit 6 mixing circuit 10 still area processing circuit 200 motion area processing circuit 210-212 intra-field interpolation circuit 230-232 subtraction circuit 260 inter-field interpolation circuit 27 Mixing circuit S 0 Current field signal S1 1 field previous signal S2 2 field previous signal

[Procedure Amendment 13]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 15]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

Claims (3)

[Claims] 1. A decoding device for a television signal, in which pixel samples per field (or frame) are thinned out by sub-sampling and band-compressed, and a plurality of fields are used by using a field (or frame) memory. (Or frame) information, and a still area processing unit for reproducing information of a still area of an image by the television signal, and inter-field (or frame) interpolation for the current signal of the television signal, and Field (or frame) for delayed signal from field (or frame) memory of static region processor
Motion area processing for reproducing the information of the motion area of the image by the above television signal by performing internal interpolation and further inter-field (or frame) interpolation using the signals obtained by performing intra-field (or frame) interpolation. And a moving area detecting section that detects a moving area of an image based on the television signal, and outputs the output of the stationary area processing section and the output of the moving area processing section from the moving area detecting section. A television signal decoding device that synthesizes images according to the amount of motion detection. 2. The television signal decoding device according to claim 1, wherein the television signal is a high-definition video signal band-compressed by a multiple sub-Nyquist sampling method. 3. The motion area processing section includes a first interpolation circuit for interpolating a current signal of the television signal in a field (or frame), and the first interpolation circuit based on the current signal of the television signal. A first subtraction circuit for subtracting the output signal of the interpolation circuit; a second interpolation circuit for interpolating the delayed signal from the field (or frame) memory of the stationary area processing unit within the field (or frame); A second subtraction circuit for subtracting the output signal of the second interpolation circuit from the delayed signal from the field (or frame) memory of the stationary area processing unit, and outputs of the first and second subtraction circuits. 3. A television signal decoding device according to claim 2, further comprising a third interpolation circuit for interpolating between fields (or frames) by using the third interpolation circuit.